共查询到18条相似文献,搜索用时 78 毫秒
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应用模态分析技术,通过模态实验及模态参数辨识,给出转炉若干阶模态参数,根据给出的模态振型,利用TTVP程序优化设计大型转炉扭力杆,得出KR与MTmax关系最优值,并进一步进行模态分析,得出理想振型。 相似文献
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针对柴油机湿式油底壳的振动特性问题,以4120s型柴油机为例,采用有限元法对不同充液量的油底壳模态频率和振型特征进行分析,并对存在油液时的油壳系统进行增加加强板的结构改进.结果表明:随着机油量的增加,油底壳模态频率逐渐降低,模态振型也发生了显著变化;形貌优化后的油底壳,固有频率有较大提高,刚度大幅度增加,有利于减振降噪. 相似文献
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通过750m^3高炉汽轮鼓风机动叶片固有频率测定及一级动叶片模态试验,探索随机信号与振动分析在旋转机械上的应用,并为风机安全运行提供理论依据和预防措施。 相似文献
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本文运用振动理论对直线振动开铁口机进行了模态分析及起制动过程分析,在设计阶段,通过系统的动力学特性分析可以修改某些可变参数,使其运动处于最佳状态,从而提高其性能,同时使系统的动载荷减小到最低限度,提高振动开铁口机的强度和使用寿命。对于现有的直线振动开铁口机,进行动力学特性分析,可提出改进设计的有效方案。在此理论分析和现场实测数据的基础上编制了相应的软件,从而为提高此开铁口机的设计水平打下了基础 相似文献
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熊莺 《Canadian Metallurgical Quarterly》2011,(3)
为了加深学习者对日语终助词和汉语语气助词的理解和掌握,对两者进行了对比分析,指明两者共性存在于“使用场合——对话与独语”“句中位置”“地域性”和“重叠使用”四方面;差异存在于,日语终助词具有“男性用语和女性用语”的特点,且交际功能发达。与日语相比较,汉语中表示疑问的语气助词比较丰富,使用复杂。针对以上学习难点,提出参考性的教学方案。 相似文献
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通过建立高温重载工业机械手有限元模型,求解出振动频率与振型,为研制高温重载工业机械手具有良好的动力学特性提供依据。 相似文献
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在矿山呼吸性粉尘监测中 ,有时需要补充缺失的数据 ,有时出于安全环保的原因 ,需要提前知道数据。本文引入了灰色理论中的GM(1,1)模型 ,对呼吸性粉尘浓度变化趋势进行预测。通过对 2 0 0 0年德兴铜矿、永平铜矿、武山铜矿、银山铅锌矿、东乡铜矿五个矿山四个季度粉尘数据进行分析 ,建立了相应的灰色预测曲线。误差分析表明 ,这些曲线有较好的预测效果。 相似文献
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《钢铁研究学报(英文版)》2016,(8):772-777
To achieve ultrasonic casting of 35CrMo steel,the waveguide unit for introducing ultrasound into liquid steel was studied numerically and experimentally.The structure and length of the ultrasonic waveguide were opti-mized by modal analysis.The simulation results showed that a T-shaped waveguide unit matched the vibrational sys-tem better than an L-shaped unit.The performance of T-shaped waveguide unit was optimized when the length of the ultrasound radiator was 135 mm.The performance of the T-shaped waveguide unit was investigated in ultrasonic casting experiments,and the effect of ultrasound on the microstructure of 35CrMo steel was examined.The experi-mental results showed that the T-shaped waveguide was able to successfully introduce ultrasound into the 35CrMo melt.In addition,the use of a silicon nitride ceramic radiator avoided high-temperature corrosion in the molten metal. The microstructure of the treated area was significantly refined and equiaxed grains were obtained.The results repre-sented a novel method for ultrasonic casting of steel. 相似文献
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Baerwald Jeffrey P.; Tryon Warren W.; Sandford Joseph 《Canadian Metallurgical Quarterly》2001,15(4):535
This cross-sectional study examined modal attention asymmetries in patients with schizophrenia (n?=?47) and bipolar disorder (n?=?42), as contrasted to a matched-sample comparison group of normal participants (n?=?89). A test of continuous auditory and visual attention was the primary measure. The data were analyzed from 2 experimental conditions: simple modal responses (auditory and visual) and modal switching responses (ipsimodal and cross-modal switching). In the simple modal condition, patients with schizophrenia demonstrated a visual over auditory asymmetry; patients with bipolar disorder showed no differences. In modal switching conditions, however, patients with bipolar disorder displayed a significant auditory over visual asymmetry. No main effect was detected between medications and attention functioning. Results are discussed in light of differentiating these 2 populations on the basis of modal specificity of attention functioning. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献